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TECHNICAL PAPERS

Micro and Macro Deformation of Single Crystal NiTi

[+] Author and Article Information
Ken Gall, Martin L. Dunn, Yiping Liu, Paul Labossiere

Department of Mechanical Engineering, University of Colorado, Boulder, CO, 80309

Huseyin Sehitoglu

Department of Mechanical and Industrial Engineering, University of Illinois, Urbana, IL, 61801

Yuriy I. Chumlyakov

Physics of Plasticity and Strength of Materials Laboratory, Siberian Physical and Technical Institute, 634050 Tomsk, Russia

J. Eng. Mater. Technol 124(2), 238-245 (Mar 26, 2002) (8 pages) doi:10.1115/1.1416684 History: Received October 31, 2000; Revised April 18, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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References

Figures

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Comparison of load-unload behavior for Ti-50.9 at percent Ni and Ti-51.5 at percent Ni for (a) [100] and (b) [221] surface normal orientations
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Optical Images of indents for Ti-50.9 at percent Ni on (a) [100] and (b) [221] normal orientations after application and subsequent removal of 1000 mN
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Seven different normal orientations considered in the experimental study on single crystal NiTi
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Schematic of the NiTi samples used for compression and indentation testing. The different normal orientations considered are shown in Fig. 1. The compression axis was parallel to the normal orientation, and the micro-indentation was conducted on a surface perpendicular to the normal orientation.
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TEM image of the microstructure of a Ti-50.9 at percent Ni sample with a [210] surface normal after indentation
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Surface normal orientation dependence of micro-indentation tests on single crystal Ti-50.9 at percent Ni. The individual curves are the average of five curves at different spatial locations shown in Fig. 2. Figure 4(b) is a magnified view of the tip of the curves in Fig. 4(a).
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Comparison of micro-indentation tests on single crystal Ti-50.9 at percent Ni and Ti-51.5 at percent Ni for different surface normal orientations
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Maximum compressive Schmid factor contours in the standard stereographic triangle for martensite formation with internal 〈011〉 Type II-1 twins. The calculations were performed in 35 using the energy minimization theory presented in 36. The twinning mode found to dominate in solutionized NiTi is 〈011〉 Type II-1 33839.
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Series of optical images on Ti-50.9 at percent Ni demonstrating that the ridge morphology surrounding the indentor does not have a strong dependence on the relative orientation of the indentor and material (rotated around the surface normal)
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True compressive stress-strain response for samples with the seven different normal orientations in Fig. 1. All tests begin at zero stress and strain, but are moved for presentation clarity.
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Maximum Schmid factor contours in the standard stereographic triangle for the 〈100〉{001} and 〈100〉{011} families of dislocation slip systems

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